DS is 7wks tomorrow. He's EBF and feeds at least every two hours, day and night [yawn]

For the last few days I've been having stomach cramps (like a period) and today I've developed that horrid period backache. My lochia stopped at 3wks and hasn't come back.

With my older child I had to totally wean to get my cycles back (ie not be producing a single drop of milk): surely I can't be getting them back so soon with this baby? If not, are these just extended afterpains??